When the message comes up saying what you've been banned for ETC you have no option than to click 'Ok' and it disconnects you from the server.
You could maybe packetlog the exe, File the code for the message and you could filter this packet and make it like a normal message like 'You've already chosen this weapon' instead of the punkbuster one, The 'You've already chosen this weapon' might only appear once during game play..
Its just a theory, I'm a newbism.
Don't flame please
-Andy.